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The last 4 posts

i assume you mean the common ["the ground wire].
i didn't see any nicks in the wire. i crawled under the crawl space yesterday; there was no visible nicks or breaks in the wire. there are a few areas, under bushes, etc. that i have not checked. i will do that.

there is no spare wire, all 7 seven are used; 6 for 6 zones and a white for the common [neutral/ground wire].

i'm not entirely sure how to test the wiring. i've gathered with a multimeter.
i'm sure that question has been answered before, can you direct me?

The ground wire's probably bad.
Possibly all the wires were cut somehow.
Do any digging recently?
Is there a spare wire at the valves you could use for a new ground wire?
Test the wiring to see if it's bad.

half my zones will not turn on

front lawn:
program A
zones 1, 2, 3
these work fine.

back yard:
prgram B
zones 4, 5, 6
these do not turn on at all.
i can manually turn the zones on, but they do not turn on with the control box.
i checked the wiring (traced it visually, no nicks or exposed wires) and it seems to be ok.
what next?